Building-slab.



L, BAUMGARTL.

BUILDING SLAB. APPLICATION FILED AUG. 11, 1913.

Patented Mar. 3, 1914.

2 HEET3-SHEBT l.

L. BAUMGARTL.

BUILDING SLAB.

APPLICATION FILED AUG. 11, 1913.

Patented Mar. 3, 1914.

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j; jero j Jew UNITED STATES PATENT OFFICE.

LEROY BAUMGARTL, OF CHICAGO, ILLINOIS, ASSIGNOR TO FEDERAL CEMENT TILE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BUILDING-SLAB.

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Specification of Letters Patent.

Patented Mar. 3, 1914.

Application filed August 11. 1913. Serial No. 784,204.

T 0 (7 whom it may concern:

Be it known that I. LEROY BAUMGARTL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois. have invented a new and useful Improvement in Building-Slabs, of which the following is a specification.

My invention relates to improvements in slabs of concrete, clay. or the like substance, which are used for forming walls, floors, ceilings. roofs, and the like, my invention having been devised, more especially, in connection with roofing slabs or tile, formed of concrete.

My primary objects are to provide a con- Struction of building slab which will present the desired air space therein for insulating the structure formed from the slabs, against heat and cold; which may be economically and quickly manufactured; may be Quickly assembled into the structure to be produced, and when so assembled, will present the desired strength of structure and produce the sealing of the ends of the chambers forming the air spaces; and which may be made in relatively larger sizes than those hitherto provided.

Referring to the accompanying drawings-Figure l is a broken perspective view of a roof, or floor. formed of slabs con-' structed in accordance with my invention. Fig. 2 is a broken plan view of one of the similar slabs shown in Fig. 1. Fig. 3 1s a broken edge view thereof. Fig. 4 is a sectional view taken throughoneof the supporting beams and showing the slabs supported thereon, in elevation. Fig. 5 is an enlarged section taken at the line 5 on Fig. 2 and viewed in the direction of the arrow; and Fig. 6. a modification of the slab illustrated in the precedin figures.

In the drawings, l lave shown my invention as embodied in a slab of concrete of relatively great length, though it will be understood that as to certain features of my invention the size of the slab is immaterial.

The slab illustrated in Figs. 1 to inclusive is of the form generally termed booktile, opposed edges thereof being converted and concaved as represented at 7 and 8 respectively, these surfaces preferably describing the same are so that they will interfit with the oppositely curved surface of the next adjacent slab as hereinafter described.

The slab is so constructed as to provide a chamber or chambers 9 therein, depending upon the size of the slab, these chambers which, when the slabs are assembled to-.

gather, as hereinafter described. become sealed and form air spaces. being open at the interfitting edges of the slab. The chambers 9 may be open along the concaved sides 8 of the slabs as represented, or along the convex side 7 thereof, or along both of said sides, as desired, the providing of the chambers with opposite sides open as last stated being of advantage under certain conditions where it is desirable that the air contained in the roof, or the like structure, formed of the slabs, be free to circulate therein, and to augment such circulation openings may be made from one series of slabs to the others thereof to render the air space throughout the area of the structure continuous. Where the slab is of such length as to render it advisable to provide a series of chambers 9 therein instead of a single chamber, the dividing walls 10 should be provided and be of such thickness as to stiffen the slab to the desired degree. Where the slabs are made of relatively great length. as represented in the drawings, it is desirable that they be provided with any suitable reinforcing means, such as for example those illustrated, these means being formed of rods 11, which are embedded in parallel spaced ribs 12 extending lengthwise of the slab at its underside. and a wire net work of any suitable construction extending from one rod 11 to the other thereof, in the bottom of the slab and anchored therein at the rods 11, as'illustrated in Fig. 5.

In Fig. 1, I have shown a desirable way of constructing a floor or roof of my improved slabs. As the air chambers in the slabs are not open at the ends thereof, but are open along other edges of the slabs, it is unnecessary that any angle-irons, or the like, he provided for closing these chambers, such as have hitherto been employed, it being only necessary to provide a frame-work upon which the slabs may rest at their closed ends.

A portion of such a framework is repre sented in this figure and comprises a series of parallel beams 13 supported in any suitable manner (not shown) and spaced apart from center to'center a distance equal approximately to the length of each slab.

. however, being produce the structure illustrated in Fig. 1,

the convex edge 7 of each slab interfits the concave edge 8 of the next adjacent slab, thus sealing the open sides of the chambers 9 to theatmosphere, and stiffening the upper and lower walls of the chambers at'their 0 en sides, it being understood that if des1red plaster or cement may be introduced into the joints between the slabs for insuring the complete sealing of; the chambers 9 against ingress of external atmosphere thereto. It will be understood that where the chambers 9 are open at one side only,

the assembling of the slabs as stated not only seals the chambers 9 as stated, but

also seals each chamber from the others, whereas where the chambers 9 are open at both sides as stated the assembling of the slabs does not seal one chamber from the others thereof, but does seal from the external atmosphere. f

Where the slab is reinforced, as above explained and illustrated, it is desirable that in order that relatively large bearing'areas be provided, the ends of the ribs 12 be partially cut away as indicated at 14, thus permitting the slabs to seat flatwise throughout a relatively large area on the flanges of the beams 13, as represented in Fig. 4.

In Fig. 6, I have shown a slight modification of the slab illustrated in the preceding figures. In this case opposed edges of the slab instead of being concaved and convexed throughout from the upper to the lower surfaces of the slab as Indicated in Fig. 5, are concaved and convexed throughout a lesser are as represented at 15 and 16 respectively, the idea of this construction, the same as that illustrated in Fig. 5, namely, that'of producing an interfitting of adjacent slabs one with the other for the purposes above stated. It will be understood that many other variations in the character of joints between the adjacent slabs may be provided within my invention and I do not therefore wish to be understood as intending to limit it to the precise construction shown.

As before explained, one of the advantages arising from the use of my improved slab is not only that it may be made in relatively large sizes, but that the act of assembling the slabs one with the other effects sealing of the air chambers in the slabs and a strengthening of the upper walls of the chambers, andthus the structure may not only be quickly, but economically erected.

What I claim as new and desire to secure by Letters Patent is-' I 1. A building slab formed from concrete, or the like,'having upper and lower walls spaced apart to form a. chambered area between the same, the lower of said walls being provided on its under surface with horizontally extending separated ribs spaced from the ends thereof, reinforcing means embedded in said ribs, and transversely extending reinforcing means embedded in the structure and connected with said first'mentioned reinforcing means.

2. A structure comprising a series of building slabs formed from concrete, or the like, each ofsaid slabs having interlocking edges and upper and lower walls spaced apart to form a chambered area between the same, the lower of said walls being provided on its under surface with horizontally extending separated ribs spaced from the ends thereof, reinforcing means embedded in said ribs, and transversely extending reinforcing means embedded in the structure and connected with said first-mentioned reinforcing means.

3. A building slab formed from concrete, or the like, and having spaced walls forming a chambered area between the same, one of said walls having horizontally extending ribs spaced from the ends thereof, that portion of the wall between said ribs being increased in thickness, reinforcing means embedded in said ribs, and transversely extendingreinforcing means embedded in the thickened portion of said wall and connected with said first-mentionedreinforcing means.

LEROY BAUMGARTL. In presence of- L. HEISLAR,

A. J. FLOYD. 

